We mentioned a peculiar duality in \(d=2\)  between the ultra-relativistic or \(c\rightarrow 0\)  and the non-relativistic or \(c\rightarrow \infty \)  theories in the introduction. It is instructive to check that the limit diametrically opposite to (REF ) [1]}:
\( \sigma \rightarrow \epsilon \sigma , \rightarrow , \, \epsilon \rightarrow 0\) 
